If you'd like to send out email messages through an email address with your very own domain, you have to make sure that the company will give you access to their SMTP server. The latter is the software system allowing email messages to be transmitted. SMTP is an acronym for Simple Mail Transfer Protocol and it deals with all outbound email messages from applications, webmail and contact forms. When a message is sent, the SMTP server confirms with all of the DNS servers worldwide where the e-mails for the receiving domain name are taken care of and as soon as it acquires this information, it connects into the remote POP/IMAP server to see if the recipient mail box exists. If it does, the SMTP server sends the message body and then the receiving server delivers it to the mailbox in which the recipient can open it and read it. With no SMTP server on your server, you won't be able to mail out e-mails in any way.